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While matrix-isolation spectroscopy has been able to produce vibrational frequencies for some of the vibrational modes, the full infrared to microwave spectrum of 1 2A\u2032 HSO2 is yet to be generated. High-level quantum chemical computations show in this work that the &amp;gt;2.5 D dipole moment of this radical makes it a notable target for possible radioastronomical observation. Additionally, the high intensity antisymmetric S\u2013O stretch is computed here to be 1298.3 cm\u22121, a 13.9 cm\u22121 blueshift up from H2 matrix analysis. In any case, the full set of rotational and spectroscopic constants and anharmonic fundamental vibrational frequencies is provided in this work in order to help characterize HSO2 and probe its kinetic favorability.<\/jats:p>","DOI":"10.1063\/5.0062560","type":"journal-article","created":{"date-parts":[[2021,9,15]],"date-time":"2021-09-15T10:03:07Z","timestamp":1631700187000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":3,"title":["Anharmonic fundamental vibrational frequencies and spectroscopic constants of the potential HSO2 radical astromolecule"],"prefix":"10.1063","volume":"155","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4716-8225","authenticated-orcid":false,"given":"Ryan C.","family":"Fortenberry","sequence":"first","affiliation":[{"name":"Department of Chemistry and Biochemistry, University of Mississippi 1 , University, Mississippi 38677-1848, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5461-1486","authenticated-orcid":false,"given":"Joseph S.","family":"Francisco","sequence":"additional","affiliation":[{"name":"Department of Earth and Environmental Science, University of Pennsylvania 2 , Philadelphia, Pennsylvania 19104, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2021,9,15]]},"reference":[{"key":"2023070402072266300_c1","doi-asserted-by":"publisher","first-page":"100062","DOI":"10.1016\/j.molap.2019.100062","volume":"18","year":"2020","journal-title":"Mol. 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